Balanced throttle-valve.



LE COP" No. 817,153. BizSW AVAILAB PATENTEDAPR. 10, 1906.

N. S. BARR. BALANOBDTHROTTLB VALVE.

APPLICATION FILED JUNE 21,1905.

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UNITED STATES 8E3TAVAlLABLE COP PATENT orrrcn.

NORMAN s. BARR, 0F TOMBSTONE, ARIZONA TERRITORY,

BALANG'ED' THROTTLE-VALVE,

Specification of Letters Patent. c

Patented April 10, 1966.

Application filed June 21, 1966. Serial No. 266,213.

To add w/wl'n it may concern:

zen of the United States, residin at Tombstone, in the county of Cochise, Territory of,

Arizona, have invented a certain new and useful Balanced Throttle-Valve, of which the following is a specification.

The main object of this invention is to provide a throttle-valve which will be balanced as regards the pressure of the steam thereon, so that it can be closed and opened with a minimum expenditure of force.

A further object of this invention is to provide a throttle-valve in which the admission or flow of steam or fluid can be graduated or closely regulated.

Another object of the invention is to provide for convenient renewal of the wearing parts.

Another object is to provide for maintenance of the steam-tight packin of the valve by the pressure of the steam itse f and for adjustable tightening of said packing.

The accompanying drawings illustrate the invention.

Figure 1 is a longitudinal section. Fig. 2 is a transverse section on the line 00 :0 Fig. 1. Fig. 3 is a side elevation of the valve-bushing. Fig. 4 is a development of the ports in said bushing.

The valve body or casing (indicated at 1) is preferably cast in one iece and may be of a more or less cylindricaPform, having openin s 2 2 at the respective ends of the cylin er. An inner valve-casing 3 is formed Within and preferably integral with the easing 1, said casing 3 extending from one side wall of the outer casing 1' in approximately semicylindrical form and having end walls 4 parallel to the end walls 5 ofthe outer casing, the said outer and inner casings forming an external valvechamber 6 between the outer and inner casings and an inner valve-chamher 7 within the inner casing. An inlet or pressure connection 8 leads through the outer casing into the outer valve-chamber 6, and an outlet connection 9 leads through said outer cyli v outer casing. Said openings in the outer Be it known that I, NORMAN S. BARR, a citimit steam-tight passage of the valve-rod 13.

Said valve-rod 13 o erates the. valve or valve-plug 15, which slides in a valve-cylinder formed by the cylindrical tubular bushing or valve support 16 and cylindrical gland 17, which are supported Within the ubs 1O 11 aforesaid.

The valve 15 is preferably formed as a hollow cylinder having a head or end wall 15 at one end, with an opening 15", through-Which valve-rod 13 passes, said opening being suili' ciently large to allow a little play between the valve and valve-rod and the valve-rod having a shoulder or collar 13 and a nut 13, en ga'gmgon opposite sides of said end 15 of the valve to o crate the valve in the movement of the va ve-rod.

The-hub or projecting flange 11 is longer than the hub'of the adj acent flange 10, and the bushing 16 extends from within thehub 10 across the intervenin annular ort or opening 18 be tween the hubs to some .istance within the hub 11.

12, being provided to press the gland 17 against said packing. The ends of bushing .16 and gland 17 are preferably beveled, as at 16 17'. lock same and give-a ti ht joint.

The bushing 16 has a flange or shoulder 22 engaging in a countersink or rabbet 23 in the end 4 of the internal valve-casing i The valve-seat member 24 is formed as a tube or cylinder having a flange 25 extending over the end of the bushing 16 and secured by screws 26 to the end wall of the inner valvecasing, the inner end of said valve-seat being preferably beveled, as at 27, and the end of the valve-plug 15 being correspondingly beveled, as indicated at 28. The opening 2 in end of outer casing 1 is larger than valveseat member 24, so that on removin the end plate 12 and unscrewin screws 26 t e valveseat can be removed an renewed, as can also the bushing 16, which is normally held in place by seat member 24. Similarly, gland 17 can be removed at the other end.

Nuts 20' on said screws serve to or closer re The portion of the bushing that bridges across the space'between the hubs 10 i1 is provided with lateral ports 30, which are ar ranged in circumferential order around said bushing and. are preferably offset progressively in a longitudinal direction, as indi-- cated in the development in Fig. 4, so that they will come into action successively as the valve is moved, thereby allowing graduation lation. To increase the closeness of regu ation,each of the ports may have its end toward the seat formed slanting or oblique, so as to ive a gradual cut-oil by edoperation with the valve. p

The operation is as follows: The SiDQELIPdOl fluid pressure medium entering through inlet connection 8 fills the outer chamber 7, and if the valve is open said medium communicates throu h the cylindrical valve-seat member 24 an one or more of the ports 30 into the internal valve-chamber 7 and out throng Tie outlet 9. By operating the valve-rot .ne valve can be moved more or less toward its seat, thereby cuttin off or closing the lateral orts 30 progressive and after the last port as been closed the final movement of the valve brings it against the valve-seat 24 to give a tight closure, the end of the valve abutting against the valve-seat, thereby preventing access of steam between said valve and seat and eliminating the pressure at that point at the end of the valve and reducing the endwise pressure on that end of the valve, so

as to enable the excess of pressure in the.

other direction on the valve to hold the valve closed. Assuming that valve is closed steam will surround the valve-casmg and both ends of the valve. 'On account of the.

valve being closed against the seat the steamipressure cannot act against the area taken up y the seat. Therefore the other end of the valve will have an excess offpressure equal to the pressure on the area 0 the seat. This serves to hold the valve tight against the seat, but is not enough to be appreciabl felt on the end of the throttle-lever. (Not 5 own in drawings.) When the valve is pulled out way from the seat, the exposed area on both ends is exactl the same. Therefore the valve is in a solute balance. When the valve is closed, the seatholds the steam from going throu h to outlet on that end, and the packing an gland keep-the steam from going through on theother end, thus keeping the joint steamtight until the packing is wornout.

What I claim is" i i c 1. A valve comprising 0 lterand inner casings formed with outer and inner-chambers provided with inlet and outlet connections, a tubular valve-sup ort ext'endin the nner chamber an having latera ports opening into the said inner chamber, avalye slid ab y mounted in the said tubular, valve-sup,- port to close and open said'ports, the outer EST AVAlLABLE COP chamber extending to each end of thetubular valve-su port and of the valve, to expose both ends 0 the valve to the pressure in said chamber, and an operating-rod connected to said valve and extending through the wall of the outer chamber. I g

2. A valve comprising outer and inner casings formed with. outer and inner'ehambers,

provided with inlet and outlet connections, a tubular valve-sup ort extending within the inner chamber an having ports 0 ening into the said chamber, a valve slidabl in the saidtubular valve-support to close and .open said ports, an operating-rodconnected to saidvalve and extending t irough the wall of the outer chamber, a tubular valve-seat within said valve-support and engaged end abutting the valve when the latter is closed to reduce the endwise pressure in one direc-- tion on the valve and enable the excess of pressure in the other direction to hold the valve closed.

3. ,A valve-chamber having lateral ports, and a valve slidirn in said chamber and exposed at both ends to the pressure in 'said' 0 chamber to balance the pressure on the valve when the valve is open? and a seat in said chamber, said valve havinga portionabutting said seat when the valve is closed to re- I heve the pressure in one direction on the valve and cause excess of pressure in the d1- rection tending to hold the valve closed.

. 4..A valve-cylinder having lateral ports and a tubular seat member, in combination" with a valve sliding in said cylinder and closing said lateral ports and engaging said seat.

member, and an outer cham er surroundm said valve-cylinder and extending to hot ends of the valve to produce pressure on each end thereof.

5. A valve-cylinder having lateral ports and a tubular seatmember, in combination with a valve sliding in said cylinder and closing said lateral ports ,and'engaging said seat member, an outer chamber surrounding said valve-cylinder and extending to both ends of the valve to produce (pressure on each end j operatively connectthereof, and a valve-ro ed to 'said valve and extendingthrough the walls of the outer chamber. a

6. A valve-cylinder having lateral ports and a tubular renewable seat member, 1n

pombination with a valve sliding in said cylinder and closing said lateral ports andengaging said seat member, an outer chamber surrounding said valve-c linder and extending to both ends of the va ve to produce pressure on each end thereof, and having an o enmg for removal of the seat member, an a detachable closure for said opening.

7. The combination of outer and inner valve-chambers, the inner valve-chamber. having a cylindrical passage extending therethrough and communicating at its ends with the outer chamber, a tubular bushing in one 1 9 r mounted end of said passage having ports opening to the inner chamber, a gland'in' the other endof said passage, a valve sliding within said bushing and gland, and packing between the bushin and glan 8. T e combination of outer and inner valve chambers, the inner valve chamber having a cylindrical passage extending therethroughand communicating at its ends with the outer ,chamber, a' tubular bushing in one end of said passage having ports opening to the inner chamber, a land in the other end of said passage, a va ve slidin within said bushing and gland, acking etween the bushing and gland, and m'eans for adjustably pressin said gland toward said bushing. f

9. T a combination of outer and inner valve chambers, the inner valve chamber having a cylindrical passage extending therethrough and communicating at its ends with the outer'chamber, a tubular bushing in one end of said passage having ports opening to the inner chamber, a land 1n the other end of said passage, a va ve slidin within said bushing and gland, packing etween the V and a 'valve within said cylinder, an inner chamber seer AvAaLAsLs coi bushing and gland, and means. for adjustably pressing saidgland toward said bushing consisting of screws engaging with said gland and with the end wal 0 10. A valve-cylinder formed of a bushing gland with intervening packing, a

formed with a passage therethrough containing said bushing, gland and packing, a valve seat member detachably secured to a wall of said inner chamber and extending within the bushing and holding the bushing in place, and an outer chamber extending to both ends of the inner chamber and to both ends of the valve, and having an openin op o'site the detachable valve-seat, and a detachable closure-plate for said openin In testimony whereof have hereunto set the outer chamber.

my hand, at Tombstone, Arizona, this 10th day of June, 1905. I

NORMAN S. BARR.

In presence of A. WENTWORTH, W. DECKERAW. 

